In the trailer, skunk'ape is shooting a gun at an unknown target, could he be trying to defend max's brain? and didn't he also steal gordons brain in order to control the toys?

My guess is the unknown target being Sam who may or may not have recovered Max's brain from Skunk'ape and now the power hungry gorilla and his minions are trying to, well, shoot Sam. That would be rather epic now that I think about it...I'm going to hush up for now.